Related Clues:

• Trip agent?
• One litmus test conclusion
• Tough on the tongue
• Exceedingly caustic
• Like limes
• Caustic compound
• Hydrofluoric ___
• Tongue-curling
• Cold drink
• It's dropped for kicks
• Small pie
• Burn cause
• Very bitter
• Hydrochloric or amino, e.g.
• Bitterly pungent